The dulac box plant produces 500 cypress packing boxes in two 10-hour shifts. due to higher demand, they have decided to operate three 8-hour shifts instead. they are now able to produce 600 boxes per day. what has happened to productivity? (round each intermediate calculation to 2 decimal places) it has increased by 50 sets/shift. it has increased by 37.5 sets/hr. it has decreased by 20%. it has decreased by 6.7%. it has decreased by 9.1%. none of the above